Rode makes a lav microphone with a detachable cord and swappable ends.

fantastic -- rich bass for nice chest tone, and picks up pleasant high-end sibilance from collar region

The included mic sounds quite good and has a nice low-end which is often missing on the built-in mic included with most wireless systems

The lav mic that comes with the set is Rode's top end lav that costs half as much as the price for the entire kit